The Buoys were lateral markers to help mariners navigate the safe way up the Victoria Channel in Belfast Lough into Belfast port.
The Red Boy was a left side marker, the Black Buoy, a right side marker and the Striped Buoy marked the junction in the channel.
The three buoys are estimated to be around eighty years old.
Each one weighs around 3 tonnes and are made of thick steel plates riveted together. They are hollow structures, filled with air to allow them to float, and they would have been secured in place by mooring chains, attached to a cast iron sinker sitting on the sea bed.
Do you want to learn more about the history of Belfast? See these bouys on my Titanic Quarter & Maritime Belfast tour!